/Engine/Plugins/Runtime/RigVM/Source/RigVM/Public/RigVMCore/RigVMMemoryCommon.h
TheFRigVMOperandrepresents an argument used for an operator within the virtual machine. Operands provide information about which memory needs to be referred to, which register within the memory all the way to the actual byte address in memory. TheFRigVMOperandis a light weight address for a register in aFRigVMMemoryContainer. For external variables the register index represents the index of the external variable within the running VM.
[USTRUCT](Programming/UnrealArchitecture/Reference/Structs)() struct FRigVMOperand